Pencil-sharpener



W. C. JOHNSON.

PENCIL SHABPENER.

APPLICATION FILED MAA. I3, |920.

Patented @et M. 1921.

GS ff. l 25 d2, l( 27 r Vy 11K l 1715 i? l l E O a6 Y III; W //FE A y v f /fff WILFIAM C. JOHNSON, 0F NEW HAVEN, GONNECTIGUT.

@ENGEL-SHPENEB..

Specification of Letters ratent. Patented Utet. lill, i921.,

Application filed March 13, 1920. Serial No. 365,395.

To all whom t may concern.'

Be it known that l, WILLIAM C. JOHNSON, a citizen of the United States, residing at New Haven, in the county of New Haven and State of Connecticut, have invented a new and useful Improvement in Pencil- Sharpeners; and l do hereby declare the following, when taken in connection with the accompanying drawings and the characters of reference marked thereon, to be arfull, clear, and exact description of the same, and which said drawings constitute part of this application, and represent, in

Figure 1, a view in vertical central section of a pencil-Sharpener constructed in accordance with my invention.

Fig. 2, a view thereof in vertical transverse section on the line 22-of Fig. 1, and looking inward toward the cutters.

Fig. 3, a view in central horizontal sec- -tion on the line 3-3 of Fi 2.

Fig. 4, a detached plan vlew of the cuttercarrier showing the cutters by broken lines.

Fig. 5, a detached plan view of the cutter.- carrier shown as turned a quarter-turn from the position in which it is shown in Fig. 4. F1g. 6, a detached'end View of one ofthe cutters.

Fig. 7, a detached broken perspective view of the chip-receptacle.

My invention relates to an improved pen take up the wear on the bearings.

With these ends in view, my invention consists in a pencil-Sharpener having certain details of construction as will be hereinafter described and pointed out in the claims.

in carrying. out my invention as herein shown, li employ a two-part case or housing consisting of complementary parts 4 and 5- provided with offsetting lugs 6 by mea-ns of 'which they are fastened together by screws 7, the case-part 5 being formed with an integral, inclined, outwardly extending sleeve 8 provldlng a bearing for' the shaft 9 the outer end of which carries a handle-lever 10 thus located in front of the said case and furnished with a handle-grip 11.

Within the said two-part case, li journal a skeleton-like cutter-carrier provided at its outer end with a hollow pencil-point-receivingtrunnion 12 having bearing in aprojectlng bearing-sleeve 13, the semi-circular halves 'of which are formed integral with the respective case-parts 4 and 5. 'At its in ner end, the said cutter-carrier is formed w1th a solid trunnion 14 entering a bearinghole 15 formed in the conical two-part-trunnion 16 by which the device'as a whole is supported, as will be described later on, and which consists of two half-cones respectively lcast integral with the oase-members 4' and 5. Adjacent to the conical trunnion 16, the

cutter-carrier is formed with an annular.-

flange 17 which bears upon the inner face of the two-part conical trunnion 16, as clearly shown in Fig. 3, andtakes the endwise thrust imposed upon the cutter-carrier when the pencil is inserted into the hollowtrunnion l12 and pressed'inward'into the device.

Near its outer end, the cutter-carrier is formed with integral complementary arms 18 located opposite each other, inclined from Jfront to rear, and carrying screw-pivots 19, the pointed inner ends of which respectively enter corresponding conical recesses 20 formed in the outer ends ot a pair of complementary conical cutters 21. the inner ends (Fig. 1) of which are formed with conical recesses 22 for the reception of pivot-pins 23 having conical heads and mounted in inclined positions in the bottom of a conical observation-chamber 24 formed at the in'ner end of the cutter-carrier between the annularthrust-taking ange 17 -and the bevel-gear ico which the inner ends of the cutters 21 extend and in which the extreme point of the pencil is sharpened. The arms 18 of the cutter-carrier and the bevel-gear 25 thereof g are in turn united by two integral parallel arms 27 shown in transverse section in Fig.v

2, the pencil-receiving space 28 between these arms 27 being in line with the pencil-receiving bore or passage 29 of tho hollow-trunnion 12 at the outer end of the cuttercarrier.

It will be observed by reference to Fig. 4 that, as aforesaid, the cutters 21 extend rearward through the bevel-gear 25, projecting sufficiently through the same into the observation-chamber 24 to permit the extreme A point of the encil to be under constant observation whi e it is being sharpened, whereby any unnecessary cutting away of the pencll is avoided. As shown, the cutters 21 are slightly overlapped, but this is no feature of my present invention.

The cutting-edges or lands, of the conical cutters 21 are uniform in width, but progressively decrease in their separation from each other, from the outer to the inner ends of the cutters, as shown in Fig. 6. By thus contracting the spaces between their cutting edges or lands, the lands are adapted to support the exposed portion of the lead and the adjoining beveled portion of the wood in such a manner as to in large part resist the side-thrust which so frequently break the lead, in pencil Sharpeners of the type lto.

which my invention belongs.

For revolving the cutter-carrier and the cutters, I employ a driving-pinion mounted uponv the inner end of the handle-shaft 9 and meshing into the bevel-gear 25 of the 'cutter-carrier, and also into the crown-teeth 31 of an annular crown-wheel 32 having a' circumferential rib 33 running in an internal peripheral groove 34 'formed within the two parts 4 and 5 of the case, in which the said crown-wheel is rotated by the driving pinion 30. The spur-teeth 35 of the said crownwheel mesh directly into the teeth formed by the forward terminals of the cutting edges of the cutters, as shown in Fig. 2.

When the handle of the device is turned, the cutter-carrier is rotated, whereby the cutters journaled therein are bodily rotatedl with it in the same direction, while they are additionally rotated toward each other in the opposite direction by the rotation of the crown-wheel 32 which is also/driven directly by the pinion 30, as described. I am thus enabled to independently rotate the cutters at a relatively high speed with reference to the speed of their bodilyrotation with the cutter-carrier, with'the result of securing a shearing rather than a tearing cutting of the lead and wood of the pencil and so protecting the point thereof.

nthis connection, I may call attention to the fact that the handle comprising the lever 10 and grip 11, by being located on one side of the device and in effect in front of its case,

rather than at the inner end thereof, permits the devlce to be installed and operated with more economy of space than when the han.-`

dle is located at one of its ends, which is the customary way. In cases where the device is applied to a wallrather than to a table or desk, it will be found particularly convenient to have the handle arranged in front of the case rather than at its end.

The two-part case'of 'the device is mounted through the medium of its conical two-part trunnion 16 in conical bearing 36 made integral with the upper end of a stand 37 having a circular base 38 by means of which it is secured to the top of the desk or'other support. A thumb-screw 39 having a bearing-flange 40 and a threaded-stem 41 is employed for securing the trunnion 16 in the conical bearing 36 either in the vertical position ofthe case in which it is shown in Fig. 2, or at any desired angle, the operation of the stem 41 which enters a threaded hole in the said trunnion, being to draw the face of the same into the conical bearing 36 so as to firmly bind it therein. I am thus enabled to setthe case at any angle desired, with respect to the stand 37 or to line it up therewith. Thus, when the device is applied to a wall or vertical surface, its standard 17 Will be in the horizontal plane and its two-part case swun on its two-part trunnion 16 in the conica bearing 36 so as to bring the case itself into the vertical plane.

For the reception of the chips, I employ a basket-like chip-receptacle 42 furnished at its upper end upon its respective parallel s ide edges with laterally yielding suspension lips 43 engaging with parallel longitudinal ribs 44 upon the lower edges of the sides of the case-parts 4 and 5 as shown in Fig. 2. This construction enables the chip-receptacle to be applied to or removed from the case by a simple sliding movement.

The cutter-carrier is formed with the usual conical pencil-guide 45 in line with the hollow pencil-point-receiving trunnion 12 and also with the pencil-receiving space 28 aforesaid.

I claim:

1. A pencil-Sharpener having a cuttercarrier, two conical cutters tapering from end to end mounted in the said carrier at an angle with respect to each other for the initial insertion of the pencil between their larger ends, and means for driving the said cutter.

2. In a pencil-Sharpener, the combination with a cutter-carrier, of two cutters mounted therein, a gear mounted upon the cuttercarrier ifor the rotation thereof and adapted to l have the smaller ends of the cutters -passed through it and the said carrier being recaer/e n being skeletonlzed to permit the observation of the point olf the pencil while the same is being sharpened.

4c. A pencil-Sharpener having a cuttercarrieir comprising a hollow-trunnion located at its outer end, cutter-supporting arms, a rear trunnion, a bevel-gear, arms connecting the said outer trunnion and gear with a pencil-receivingspace between them, and arms connecting the said rear trunnion and bevel-gear to form an observation-cham'- ber which receives the inner ends of the cutters which pass through the said gear. v

5. lln a pencil-Sharpener, the comblnation with a case provided with a conical trunnion,

` pencil-cutting means installed within the said case,` a standard provided at its upper end with a conical bearing for the reception of the said conical trunnion, and means for securing the said'trunnion in any desired position within the said conical bearing.

6. lnl a pencil-Sharpener, the combination with a two-part case one art of which is provided with an inclined earingsleeve, of a cutter-carrier journaled in the said case, cutters mounted in the said carrier, a bevelgear carried by the cutter-carrier, a crownwheel mounted in the case and engaging with the cutters Efor rotating the same, a handle-shaft 'mounted in the said bearingsleeve, a gear mounted upon the said shaft and engaging with the said bevel-gear and crown-wheel, whereb the cutter-carrier and the cutters are simu taneously rotated, and means for mounting the said case.

7. ln a pencil-Shar ener, the combination with the case thereo of pencil-sharpening means installed therein, and a' chip-receptacleremovably applied to the lower end of the said case from which it is removable `and replaceable by longitudinal movement with respect thereto, the parallel Yside edges with the case thereof, of a cutter-carrier till journaled for rotation therein, 'two cutters mounted in the said carrier, and means for bodily rotating the said carrier and for independently rotating the said cutters in the opposite direction from which they are rotated by the carrier, the said means including an annular gear mounted within the said case so as to rotate therein.

9. ln a pencil-Sharpener, the combination with the case thereof, of a cutter-carrier journaled therein, two cutters journaled in the said carrier, a gear carried by the carrier, an annular gear mounted within the said case for rotation therein and arran ed to rotate the said cutters toward each ot er in the opposite direction from which they are rotated by the carrier, and a drivingpinion engaging with the ear carried by the said cutter-carrier and t e said annular ear.

g 10. ln a pencil-Sharpener, the combination with the case thereof, of a cutter-carrier journaled therein, two cutters journaled in the cutter-carrier, a gear carried -b the vtv carrier, an annular gear mounted Within the l case for rotation therein and having teeth engaging directly with the said cutters for rotating the same toward each other independently of the rotation of the carrier, a handle-shaft mounted'in the said case, and a driving-pinion connected with the. said handle-shaft andmeshing directly into the gear of the cutter-carrier and into the said annular gear.

11. ln a pencil-Sharpener, the combination with the case thereof, of a cutter-carrier journaled therein, two cuttersjournaled in the said carrier, and means lfor revolving the cutters toward ,each lother at a greater speed than the speed at which they are bodily rotated with the cutter-carrier including an annular crown gear 'rotatin u on its periphery, within the said case, an directly engaging the said cutte.

lln testimony whereof, l have signed this specification in the presence of vtwo subscribing witnesses.

WlLLllAl/l C. JOHNSUN.

. Witnesses:

Gr. W. Knnrnnr 

